ABB RED615 Product Manual page 36

Line Differential Protection and Control
RED615
Product version: 2.0
Table 34. Transient/intermittent earth-fault protection (INTRPTEF) main settings
Parameter
Directional mode
Operate delay time
Voltage start value
(voltage start value
for transient EF)
Operation mode
Peak counter limit
(Min requirement for
peak counter before
start in IEF mode)
Table 35. Negative phase-sequence overcurrent protection (NSPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative sequence current before fault = 0.0, f
measurements
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 x I
36
Function
INTRPTEF
INTRPTEF
INTRPTEF
INTRPTEF
INTRPTEF
I = 2 x set Start
Fault
value
I = 10 x set Start
Fault
value
= 50 Hz, results based on statistical distribution of 1000
n
, Start value multiples in range of 1.5 to 20
n
Value (Range)
1=Non-directional
2=Forward
3=Reverse
40...1200000 ms
0.01...0.50 x U
n
1=Intermittent EF
2=Transient EF
2...20
Value
Depending on the frequency of the current
measured: f ±2Hz
n
±1.5% of the set value or ±0.002 x I
Minimum Typical
22 ms 24 ms
14 ms 16 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50dB at f = n x f
n
...
1MRS756500 B
Issued: 03.07.2009
Step
10
0.01
n
Maximum
25 ms
17 ms
3)
, where n = 2, 3, 4, 5,
ABB